How to replace a dishwasher's belt:

Common dishwasher belt Replacing a dishwasher belt
Note:
Disconnect the power source to your dishwasher before you conduct this or any other repair. Either unplug the unit from the wall outlet, remove the appropriate fuse from the fuse box, or flip the appropriate breaker in the circuit breaker panel.

Locate and gain access to your dishwasher's belt. It will be located behind the lower kickplate panel. The belt will be made of rubber and will be about twenty-five inches long. Some are clear in color, while others are black. The belt will be looped around a pulley at the base of the pump assembly and around a pulley at the base of the motor. The motor will likely be towards the right, with the pump assembly located closer to the middle.

You do not have to move the dishwasher away from the wall in order to access and/or replace its belt. You only need to remove the lower kickplate/access panel. There will be a few screws holding the lower access panel in place. Remove these screws to remove the panel. You may need to first open the door to remove the screws, but then close the door to remove the panel.

Depending on how much your worn belt is stretched, removing it might not prove to be too difficult. Replacing it, on the other hand, may require some tight maneuvering. You might want to try this tip:

  1. Place one end of the above the pump pulley, around the pump housing.
  2. Place the other end of the belt around the motor pulley.
  3. Carefully roll the belt down from the pump housing to the pump's pulley.